Khoonmengia Honbaensis, a new genus and species of temperate bambo (Poaceae, Bambusoideae) from Central-Southern Vietnam

Under the scientific research cooperation on the diversity of the family Gesneriaceae in Vietnam, botanists from Vietnam National Museum of Nature, Vietnam Academy of Science & Technology (Vietnam), South China Botanical Garden, Chinese Academy of Sciences discovered and described a new genus, namely Khoonmengia (Poaceae, Bambusoideae) from Vietnam.

Arundinarieae, Khoonmengia, is established to accommodate a unique new bamboo spe­cies, K. honbaensis, from central-southern Vietnam. The morphological features, habitats and distribution of Khoonmengia and related genera, i.e. Ampelocalamus and Hsuehochloa, are compared.

In order to investigate the phylogenetic position of this unknown bamboo, molecular phylogenetic analyses based on the nuclear gene GBSSI were also conducted, and the results proved that K. honbaensis is definitely a member of Arundinarieae with an isolated position, which also indicated that this species could not be assigned to any of the already described genera and supported the establishment of the new genus.

More details of the acticles:

Khoonmengia honbaensis A habit; B leafy branches; C branch complement; D node with buds breaking out of the culm sheath base; E node with bud inside the intact culm sheath; F culm sheath; G leafy branches at culm apex (G1 Slender branches, G2 Dominant branch); H leaf sheath; I florets; J synflores­cence composed of only one spikelet; K infructescence

Comparison of buds A Khoonmengia honbaensis, showing elliptic bud wholly sunken into culm (From N. H. Xia et al. BVN2017048) B Hsuehochloa calcarea, showing elliptic bud wholly sunken into culm (From Y. Y. Zhang zyy-030, IBSC) C Ampelocalamus actinotrichus, showing ovate bud with the base sunken into culm (From N. H. Xia et al. HN-025, IBSC) D Ampelocalamus melicoideus, showing broad ovate bud not sunken into culm (From Y. Y. Zhang zyy-033, IBSC). Scale bars: 1 cm (A, C, D); 5 mm (B)

Source: Vu Tien Chinh, Vietnam National Museum of Nature, VAST
Link to Vietnamese version

Related news